<!-- Licensed under a BSD license. See license.html for license -->
<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Textured Cube - 6 Textures</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    #loading {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        display: flex;
        justify-content: center;
        align-items: center;
    }
    #loading .progress {
        margin: 1.5em;
        border: 1px solid white;
        width: 50vw;
    }
    #loading .progressbar {
        margin: 2px;
        background: white;
        height: 1em;
        transform-origin: top left;
        transform: scaleX(0);
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
    <div id="loading">
      <div class="progress"><div class="progressbar"></div></div>
    </div>
  </body>
<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js"
  }
}
</script>

<script type="module">
import * as THREE from 'three';

function main() {

	const canvas = document.querySelector( '#c' );
	const renderer = new THREE.WebGLRenderer( { antialias: true, canvas } );

	const fov = 75;
	const aspect = 2; // the canvas default
	const near = 0.1;
	const far = 5;
	const camera = new THREE.PerspectiveCamera( fov, aspect, near, far );
	camera.position.z = 2;

	const scene = new THREE.Scene();

	const boxWidth = 1;
	const boxHeight = 1;
	const boxDepth = 1;
	const geometry = new THREE.BoxGeometry( boxWidth, boxHeight, boxDepth );

	const cubes = []; // just an array we can use to rotate the cubes
	const loadManager = new THREE.LoadingManager();
	const loader = new THREE.TextureLoader( loadManager );

	const materials = [
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-1.jpg' ) } ),
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-2.jpg' ) } ),
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-3.jpg' ) } ),
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-4.jpg' ) } ),
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-5.jpg' ) } ),
		new THREE.MeshBasicMaterial( { map: loadColorTexture( 'resources/images/flower-6.jpg' ) } ),
	];

	const loadingElem = document.querySelector( '#loading' );
	const progressBarElem = loadingElem.querySelector( '.progressbar' );

	loadManager.onLoad = () => {

		loadingElem.style.display = 'none';
		const cube = new THREE.Mesh( geometry, materials );
		scene.add( cube );
		cubes.push( cube ); // add to our list of cubes to rotate

	};

	loadManager.onProgress = ( urlOfLastItemLoaded, itemsLoaded, itemsTotal ) => {

		const progress = itemsLoaded / itemsTotal;
		progressBarElem.style.transform = `scaleX(${progress})`;

	};

	function resizeRendererToDisplaySize( renderer ) {

		const canvas = renderer.domElement;
		const width = canvas.clientWidth;
		const height = canvas.clientHeight;
		const needResize = canvas.width !== width || canvas.height !== height;
		if ( needResize ) {

			renderer.setSize( width, height, false );

		}

		return needResize;

	}

	function loadColorTexture( path ) {

		const texture = loader.load( path );
		texture.colorSpace = THREE.SRGBColorSpace;
		return texture;

	}

	function render( time ) {

		time *= 0.001;

		if ( resizeRendererToDisplaySize( renderer ) ) {

			const canvas = renderer.domElement;
			camera.aspect = canvas.clientWidth / canvas.clientHeight;
			camera.updateProjectionMatrix();

		}

		cubes.forEach( ( cube, ndx ) => {

			const speed = .2 + ndx * .1;
			const rot = time * speed;
			cube.rotation.x = rot;
			cube.rotation.y = rot;

		} );

		renderer.render( scene, camera );

		requestAnimationFrame( render );

	}

	requestAnimationFrame( render );

}

main();
</script>
</html>
